Localization of MHD modes and consistency with q-profiles in JET

R. De Angelis, M. Baruzzo, P. Buratti, B. Alper, L. Barrera, A. Botrugno, M. Brix, L. Figini, A. Fonseca, C. Giroud, N. Hawkes, D. Howell, E. De La Luna, F. Orsitto, V. Pericoli, E. Rachlew, O. Tudisco

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Abstract

The measurement of the safety factor q in tokamaks, which describes the winding of the helical magnetic field lines, is very important especially for the achievement of advanced scenarios. The motional Stark effect diagnostic can provide a direct measurement of the magnetic field orientation but the derivation of the q-profiles requires a simulation of the magnetic equilibrium taking into account inputs from several other diagnostics. This analysis can be affected by large errors. In order to validate the results, q-profiles are compared with the radii of MHD modes, which can be attributed to surfaces of known q. © 2010 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)734 - 737
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume623
Issue number2
DOIs
Publication statusPublished - 11 Nov 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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